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Orientador(es)
Resumo(s)
This paper describes an implementation of a long distance echo canceller, operating on full-duplex with handsfree and in real-time with a single Digital Signal Processor (DSP). The proposed solution is based on short length adaptive filters centered on the positions of the most significant echoes, tracked by time delay estimators. To deal with double talking situations a speech detector is employed. The floating-point DSP
TMS320C6713 from Texas Instruments is used with software written on the C++ programming language using some compiler optimizations to reduce execution time. The resulting algorithm enables long distance echo cancellation with low computational requirements. It reaches greater echo return, loss enhancement and shows faster convergence speed than the conventional solu tion. Our experimental results also approach the CCITT G.165 recommendation for echo cancellers.
Descrição
Palavras-chave
long distance echo canceller real-time Digital Signal Processor (DSP)
Contexto Educativo
Citação
Ferreira, A., Marques, P., Carvalho, H. – Long Distance Real-Time Echo Cancellation. In 6th Conference on Telecommunications – Conftele 2007. Peniche, Portugal: dblp – computer science bibliographyr, 2007. Vol. 1, pp. 597-600
Editora
dblp – computer science bibliographyr